Reliability of hop distance and frontal-plane dynamic knee
valgus angle during single-leg horizontal hop test

Ghulam, HS; Herrington, LC; Comfort, P; Jones, R

Abstract

Context: Single-leg hop for distance (SHD) performance and twodimensional
(2-D) video assessment of frontal-plane knee valgus,
during the single-leg landings, have been reported to identify the
risk of knee injuries such as patellofemoral pain syndrome and/
or anterior cruciate ligament tears. There are limited studies
investigating the reliability and measurement error in single-leg hop
for distance test and the 2-D video analysis of knee valgus angle on
landing from this maximal forward hop.
Objective: To evaluate the reliability and measurement error of
hop distance and 2-D video assessment of lower limb frontal-plane
dynamic knee valgus on landing during the SHD task.
Design: Repeated measures reliability study.
Participants: 12 recreationally active university students (8 men and
4 women 34.2 ± 3.1 y, height 170.8 ± 6.5 cm; mass 82.1 ± 15.9 kg).
Main outcome measurement: Within and between-days reliability
and measurement error values of hop performance and 2-D frontalplane
projection angle (FPPA) during SHD test.
Methods: For hop and 2-D tests: participants performed maximal
SHD with standard 2-D digital video recording of the landing for
assessment of FPPA.
Results: For hop test distance: the within-day ICCs showed good to
excellent reliability (0.89-0.93), and between-days ICCs were good, (0.85-
0.90). Standard error of measurement for SHD value ranged from 6.52-
9.83 cm. FPPA on landing: the within-day ICCs showed good reliability
(0.87 to 0.90), and between-days ICCs were good, (0.81-0.88). Standard
error of measurement for 2-D values ranged from 1.33-1.61°.
Conclusions: Hop distance and 2-D FPPA on landing during SHD
were shown to be a reliable measure of lower extremity performance
and dynamic knee valgus. Using the measurement error values
existing along with previously published normative data, clinicians
can now make informed decisions about individual performance
and variations in performance/injury risk following interventions.

Citation

valgus angle during single-leg horizontal hop test. Journal of Athletic Enhancement, 4(6), https://doi.org/10.4172/2324-9080.1000218

• Journal Article Type: Article
• Acceptance Date: Dec 22, 2015
• Publication Date: Dec 28, 2015
• Deposit Date: Jan 12, 2016
• Journal: Journal of Athletic Enhancement
• Electronic ISSN: 2324-9080
• Publisher: OMICS International
• Volume: 4
• Issue: 6
• DOI: https://doi.org/10.4172/2324-9080.1000218
• Publisher URL: http://dx.doi.org/10.4172/2324-9080.1000218
• Related Public URLs: http://www.scitechnol.com/athletic-enhancement.php